This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 18 |
| 4 | 125 |
| 5 | 1027 |
| 6 | 8435 |
| 7 | 71564 |
| 8 | 622882 |
| 9 | 5516130 |
| 10 | 49495432 |
| 11 | 448855139 |
| 12 | 4106164356 |
| 13 | 37838546363 |
| 14 | 350849788546 |
| 15 | 3270531245684 |
| 16 | 30628143485953 |
| 17 | 287992070079777 |
| 18 | 2717649138419586 |
| 19 | 25726964404879666 |
| 20 | 244242934202964444 |
| 21 | 2324722877951987037 |
| 22 | 22178433287546997612 |